Advanced Thyroid Complex is a unique combination of vitamins, minerals, herbs and amino acids formulated to help maintain normal thyroid activity. Included in the formula are: L-Tyrosine: Recognized as a conditionally essential amino acid which plays a key role in the production of the thyroid hormones. Thyroxine and Triiodothyronine. Kelp and Bladderwrack: Providing naturally-occurring levels of the essential mineral Iodine which plays a vital role in the formation of thyroid hormones. Schizandra and Ashwagandha: Used for centuries as a part of Traditional Chinese Medicine, these two herbs are thought to have a beneficial impact on individuals with an under active thyroid. Cayenne: This is herb is included for its potential benefits in helping to increase circulation ensuring that essential nutrients are effectively distributed throughout the body. Copper, Magnesium, Manganese, Molybdenum, Selenium and Zinc : These essential minerals are crucial for the production of thyroid hormones and thyroid function. Vitamin B-12: The most chemically complex of all vitamins, B-12 plays an extremely important role in the body including normal thyroid function.